I dont think thats a Muncie 4 speed input, see the small protruding register on the front of the input just in front of the in mesh teeth? notice it has a small oiling hole? Muncies did not use this, also the machined register for the main shaft in the back of input appears too small to accept a Muncie caged input roller bearing assembly, it kinda resembles a Borg T10 design in which the rollers were individual stacked. I think its a aftermarket 9310 input.
Can you post a better larger picture of part number?
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